Heidolph Hei-VAP Precision - Manual (Page 36)

Operation Operation
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Menu display
The following values can be changed in the menu view:
Selecting the entry by turning the Hei-GUIDE (6):
1. Call up the selected entry to be changed by pressing the Hei-GUIDE (6)
(entry will be highlighted in orange).
2. Set the value by using the rotary pushbutton controller Hei-GUIDE (6).
3. Pressing it again confirms the change. Softkey “Esc“ (1) terminates the change
of the currently processed entry.
4. The new settings are accepted by the “accept” entry. It is changed to the actual
value display.
All changes in the menu view are discarded with softkey “Esc“ (1).
The parameters are stored under a name to be selected by using softkey
“Store Favorite“ (1).
Heating bath Setting of the bath temperature. Setting range is between
20 °C and maximum heating bath temperature (MAX TEMP is
adjustable in Setup) with a highest range of 210 °C.
Rotation Setting of rotation speed of the distillation flask. Setting
range is between 10 and 280 rpm.
Timer Setting of the timer to shut down the process. Setting range
is between 1 and 1440 minutes. For continuous operation
choose “off” for Timer setting. The heating bath at the end
of a timed run can be set to turn off (Parameter found in
Setup).
Pump Type Selects the connected pump type. The internal control
parameters are adjusted according to the connected pump
(only by using rpm controlled pump Rotavac vario control or
Rotavac vario tec.)
Auto
easy
mode
The required vacuum is automatically calculated based on a pressure measurement in
the “AUTO
easy
” mode. The boiling pressure is detected and maintained automatically.
The “AUTO
easy
” mode is configured for easy handling and for common heating bath and
cooling media temperature. In case the amount of steam produced is insufficient and the
evaporation does not start, increase the heating bath temperature. Decrease the cooling
media temperature or heating bath temperature in case of insufficient reclaim of solvent.
Actual value display
Prerequisite: The evaporator is in the AUTO
easy
mode
Rotation speed and heating bath can be changed as described in chapter “Operating the
control panel”
Softkey “Start all” and “Stop all”
A distillation can be started and stopped automatically by using softkey “Start all” (1) and
“Stop all” (1), as described in chapter “Operation” – “Softkeys”.
Auto
accurate
Mode
The vacuum in the Auto
accurate
mode is controlled by the temperature sensor Auto
accurate
.
This mode offers the following advantages:
‒ Only low quantities of solvent are suctioned by this vacuum pump.
‒ The vapor point is detected automatically and supplemented for mixtures.
‒ Multiple solvent distillation is possible without any manual adjustments.
‒ Knowledge of the thermodynamic material data is not required.
The system controls the vacuum so that a temperature increase occurs on the AUTO
accurate
sensor via the produced vapor quantity. The temperature increase refers to the
starting temperature during the de-activated process. It is also necessary that a constant
temperature (Heidolph Rotacool or Rotachill recommended) is present in the condenser
prior to the start of the process. The Hei-VAP Precision automatically checks the
temperature consistency and informs the user, if necessary. The temperature difference
between the condenser temperature and the temperature at the AUTO
accurate
sensor used
for controlling the vacuum will be increased when increasing the Distillation rate (dT).
This results in increasing the distilled solvent quantity per time.
Temperature sensor Auto
accurate
sensor (569-00040-00) is installed (see chapter
“Accessories, spare parts” – “Accessories”). The cooling medium has run for 15 min
(Auto
accurate
sensor shows a constant temperature).
A distillation with optimal recurring data results at low values for the
Distillation rate (dT) (1-3).
Low values result in a slow distillation and high values to a quick
distillation.
Select the optimal general conditions.
Auto
accurate
mode can only be run in G3 and G6 glassware
configurations.